Connect with TRB

This is a presentation of shoreside tests performed in the investigation of static electricity as a possible cause of explosions of larger tankers. The report summarizes the shore work as performed in a 25 foot diameter tank at Paulsboro. The test variables included wash water temperature, flowrate, additives and contaminants, number and placement of washing machines. Throughout washing procedures, electrification was measured with a field meter. Field strength increased with an increase in wash water temperature for all machines and machine combinations. With wash water at 70 deg F, the field strength was stable at 125 to 330 GPM for all machines. At 160 deg F and 180 deg F, the field strength increased as flow rate increased from 125 to 225 GPM; however, no further increase in field strength occurred at 330 GPM. Detergents and contaminants as well as surface conditions of tank walls introduce variable effects on electrification. Materials that reduce surface tension also affect the field strength and polarity.